Method and apparatus for producing grinding wheels



Aug. 21, 1934.

J v.lscHAE|-ER 1,970,772 METHOD ANDAPPARATUS FOR PRODUGING GRINDING WHEELS Filed Aug. l5, 1933 M,MMM

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Patented Aug. 21A, 1.934 A x UNITED sTATEs PATENT OFFICE METHOD AND APPARATUS FOR PRODUC- INGGRINDING WHEELS .i victor Schaefer, Detroit, Mich.

Application August 15, 1933, Serial No. 685,260

6 Claims. (Cl. 51-278) Generically this invention relates to the method grinding wheel and showing the non-adhesive and apparatus for constructing grinding and polmats operatively positioned. ishing wheels or stones, but it more especially is Fig. 3 is a plan view of one of my improved directed to the type consisting of a fibrous maresilient non-adherent self-removing mats- '5- terial, an abrasive material and an adhesive sub- Practice has demonstrated the difhculty in reo stance, and the method of forming the same into moving or separating the disks from the side walls a homogenous stone-like structure, and constiof the grinding wheel body or stone after it has tutes an improvement in the subject matter of been completed, owing to the adhesive substance the application of Walter S. Rae, Serial Number employed and the pressure incident to its building 10 617,681, filed June 16, 1932, for Method and appaup process, and it was to overcome such defiratus for producing grinding wheels. ciencies and to effect the ready removal of the In the production of composition grinding shaping components without injury to the side wheels or stones of the character and in the mansurfaces of the grinding wheel, that I designed l vner above stated and as described in the above the non-adherent and cushioning mat structure, l5 referred to application, the removal of the nadapted to be interposed between the respective 70 ished wheel or stone from the shaping or formdisks and grindstone body, forming the subject ing disks is attended with considerable difficulty matter of this invention. owing to adherence of the wheel to the disks, and In the illustrated embodiment characterizing therefore the principal object of this invention this invention there is shown a rotatable shaft 1 is the provision of means yadapted to prevent such on which is mounted Aa core 2, of the desired 5 adherence, and by virtue of which said disks are size, and a pair of pressure disks 3 and 4, keyed readily and expeditiously removable from the flnor otherwise suitably secured thereon. In the ished product. present instance, disk 4 is adjustable with respect A further important object of this invention to disk 3 to accommodate different sized cores 2 is the provision of means for preventing the advand is locked in adjusted DOSitiOn by 100k mit 5 so herence of the grinding wheel body to the shapor any suitable locking means. ing disks, even under pressure, during the for- The fiber strand, strands or other fibrous matemation of said body, such means comprising a rial 6 is suitably wound on the core 2 circumflexible molded rubber mat adapted to cover the ferentially thereof and from side to side and reinner surface of the respective disks and prevent verse in spaced and Woven-like relation during 85 contact therewith of the side walls of said body. the building up process, and a suitable abrasive Another object of this invention is the promaterial and an adhesive substance in the form vision of a cushioning or resilient non-adherent of a mixture '1 is simultaneously delivered to the element interposed intermediate the grinding sump-like space 8 formed between the grinding 96 body being formed and the respective pressure wheel body 9 being formed and an interchange- 90 shaping disks to prevent the adherence of said able shoe 10 removably carried by the substanbody to said disks, said element being compressed tially triangular pressure bar frame section l1 during the body forming process, is adapted upon adaptedto continuously impregnate the strands pressure being relieved by removal of the disks, 6 with the abrasive mixture 7 and embed the same \`40' to assume its natural form, at the same time into the progressive surface of said body during 95 tending to remove itself from said body and withits building up or forming process. As this strucout damage to the surface thereof. ture is shown for illustrative purposes and as the With these and other objects in view, which abrasive delivery means, thread feeding mechalwill become apparent asi'the description pronism, and supporting and pressure control.

ceeds, the invention resides iii-the construction, mechanism for frame 11 are fully described in 100 combination and arrangement of parts, hereinthe prior .application Serial No. 617,681 above after more fully described and claimed, and illusreferred to, they are not shown. trated in the accompanying drawing, in which In order to prevent the contacting surfaces of like characters of reference indicate like parts the grinding body 9 adhereing to the shaping lto throughout the several rieures, of which: disks a and 4, with the" consequent damage w 105 Fig 1 iS an edge View 0f the Shaping dSkS partly such. surfaces in effecting removal of the disks, a in section, and grinding wheel body and mats in exible resilient rubber element or mat 12 formed operative position. lwith a circumferential right angle annular flange Fig. 2 is a perspective view partlysin section 12 and a central opening 13 is mounted on shaft 1 illustrating the manner of manufacturing a 1 adjacent each end of cone 2, said flange being 10 adapted to overlie and grip the respective. edges and the body 12 adapted to overlie the inner sur.- faces of said disks against which they are maintained by core 2, when -disk 4 has been lockcdi-n compressing position by lock nut 5. i

While thev mats 12 may be constructed without the flanges and held in position as above described, they are preferably secured by suction and the resilient annular flanges 1-2 adapted to grip the peripheral edges of the disks, as will be apparent without further discussion. 1

While I have preferably shown and referred to the employment of the core 2, itV is -to be understood that in some instances the said core-may be omitted and the fibrous material 6 wound on the shaft 1 without affecting the use -or operation of mats 12, as will beapparent.

During the forming process of the 'grinding 'wheel 9, the mats 12 will be compressed against the disks 3 and 4, and after completion of the wheel they may be readily removed, and in fact, during such removal orA as soon as the compressing force is released, said mats will resume their normal form and in doing so will draw away tending to separate-themselves from the adhereing surfaces of the wheel, aided by the gripping action of the flanges l2 with respect to the disks, thereby completing the removal of the components of -the body forming mechanism, expeditiously and without damage to or marring of the surfaces of the completed grinding wheel or stone.

As heretofore practiced, the adherence of the grinding wheel body to the inner surfaces of the pressure disks rendered the same more or less rough, so that each successive operation rendered it more difficult to effect their removal, and likewise tended to produce rough uneven side surfaces on said wheel body, which is not only entirely obviated bythe employment of the mats, but which preserves the smooth nish of the disk surfaces throughout their 'continued use, as will be clear without further explanation.

In conclusion it will be manifest that I have not only designed a matstructure constituting an improvement in the subject matter of the application, Serial No. 617,687, bu'tone manufacturable at a minimum of cost, far reaching in its operative effect, and atthe same time effecting a saving in operating and production cost.

Although in practice I have found that the form of my invention illustrated in the accompanying drawing and referred to in the above description as the preferred embodiment, is the most efficient and practical; yet realizing the conditions concurrent with the adoption of `my invention will necessarily vary, I desire to emphasize that various minor changes in details of construction, proportion and arrangement of parts, may be resorted to 'Within the scope of the appended claims without departing from or sacrificing any of the principles of this invention.

Having thus described my invention.' what I desire protected by Letters Patent is as set forth in the following claims:

l. 'I'he process 'of producing a polishing and 'grinding wheel consisting in winding brous material. circumferentially of the wheel, simultaneously applying an abrasive and adhesive mixture, and at the same time subjecting the side walls of the wheel to pressure applied through a yieldable lintermediary.

2. The process of producing a grinding wheel consisting in winding fibrous material circumferentially of the axis of the wheel, simultaneously applying an abrasive, and at the same time subjecting the side walls of the wheel tol pressure applied through an intermediary of rubber matting.

3. The process of producing a grinding wheel consisting in winding fibrous material circumferentially of the axis of the wheel, simultaneously applying an abrasive mixture, and at the same time subjecting the respective side walls of the wheel to pressure applied through a flexible molded rubber mat intermediary.

4. An apparatus for producing grinding wheels comprising a shaft, a pair of pressure disks mounted on the shaft and between which is adapted to be circumferentially wound fibrous material, means for applying an abrasive mixture to said wheel, and a flexible molded rubber mat interposed between the side walls of the Wheel and the respective disks, whereby adherence of the wheel to said disks is prevented.

5. An apparatus for producing grinding wheels comprising a pair of rotatable disks, a core mounted intermediate the disks on which is adapted to be wound fibrous material to form said wheel, means for simultaneously applying an abrasive and adhesive mixture to said Wheel, and a protective element interposed between the adherent side wall surfaces of the wheel and the respective disks, and tending upon removal of the disks to separate themselves from said surfaces.

6. An apparatus for producing grinding wheels comprising a pair of rotatable pressure disks, a core mounted intermediate the disks on which is adapted to be wound fibrous material to form said wheel, means for simultaneously applying an ad- -hesive and abrasive mixture to said fibrous material and the progressive surface of the wheel during its forming process; and a substantially non-adherent protective element adapted to cover the inner surface of each disk and engage the side wall surfaces of the wheel, whereby said elements prevent adherence of the disks to the wheel and upon removal of the disks tend to separate themselves from said wheel.

\ J VICTOR SCHAEFER.

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